No, i do not have any concrete proof. I've heard plenty or rumours that they should be out at the end of this year/early next year. You can be certain something from both these companies is coming; it's called technological advancement, if either company stood still they wouldn't be making much money and we'd all still be playing doom instead of crysis. If the rumours are to be believed it should be a big step up.
Desktop: i7 920, GTX 275, asus P6T, antec 1200, 6gb ram, 1tb spinpoint f1, 1tb spinpoint f3, Logitech Z2300, Zero DAC, Shure SRH440 Laptop: Toshiba satellite, T5300, Go 7300 Home Theatre: 32" loewe CRT, Harmon kardon amp, dvd player, image 418 speakers, rega planar 25 turntable :)
Yea I heard about these cards while doing some research for my up-coming computer build, but all thay people can agree on is that they're supposed to be much better than the current cards. However, I really don't know how much sustinence these rumours have, so I was hoping that someone here might be able to give me a bit more of a specific answer.